Feature/5 units 0.2.2 dependency refresh

.github/workflows/dependency-refresh-tests.yml

@@ -0,0 +1,77 @@
+name: Dependency Refresh Tests
+
+on:
+  push:
+    branches:
+      - feature/5-units-0.2.2-dependency-refresh
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  host-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Configure
+        run: cmake -S tests -B build
+      - name: Build
+        run: cmake --build build --parallel
+      - name: Test
+        run: ctest --test-dir build --output-on-failure
+
+  esp32-compile:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          path: project/ESPressio-Timing
+      - uses: actions/checkout@v4
+        with:
+          repository: Flowduino/ESPressio-Units
+          ref: 0.2.2
+          path: project/dependencies/ESPressio-Units
+      - uses: actions/checkout@v4
+        with:
+          repository: Flowduino/ESPressio-Observable
+          ref: 3.0.1
+          path: project/dependencies/ESPressio-Observable
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.x'
+      - name: Install PlatformIO
+        run: pip install platformio
+      - name: Create consumer project
+        shell: bash
+        run: |
+          mkdir -p project/compile/src
+          cat > project/compile/platformio.ini <<'EOF'
+          [env:esp32]
+          platform = espressif32
+          board = esp32dev
+          framework = arduino
+          build_flags =
+              -std=gnu++17
+              -frtti
+          build_unflags =
+              -std=gnu++11
+              -fno-rtti
+          lib_ldf_mode = deep+
+          lib_deps =
+              ../dependencies/ESPressio-Observable
+              ../dependencies/ESPressio-Units
+              ../ESPressio-Timing
+          EOF
+          cat > project/compile/src/main.cpp <<'EOF'
+          #include <Arduino.h>
+          #include <ESPressio_Timing.hpp>
+
+          void setup() {
+              auto& clock = ESPressio::Timing::SystemClock<>::GetInstance();
+              (void)clock.GetTime();
+          }
+
+          void loop() {}
+          EOF
+      - name: Compile Timing against released Units 0.2.2
+        run: pio run -d project/compile

CHANGELOG.md

@@ -1,5 +1,16 @@
 # Changelog
 
+## 2.2.3 — 2026-08-20
+
+### Changed
+- Raised the required ESPressio Units baseline from 0.2.1 to 0.2.2 following the Serializable 0.10.1 dependency refresh.
+- Preserved the ESPressio Observable baseline at `>=3.0.1 <4.0.0`.
+- Preserved Timing's architecture in which Serializable time representations are supplied through opt-in Serializable Unit types rather than a direct Timing -> Serializable dependency.
+- Updated package metadata and current dependency documentation for Timing 2.2.3.
+
+### Compatibility
+- No Timing public API or runtime behaviour changes are introduced by this dependency-maintenance release.
+
 ## 2.2.2 — 2026-08-20
 
 ### Changed